/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package com.antgroup.geaflow.api.window.impl;

import com.antgroup.geaflow.api.window.ITumblingWindow;
import com.antgroup.geaflow.api.window.WindowType;

public class SizeTumblingWindow<T> implements ITumblingWindow<T> {

    private final long size;
    private long count;
    private long windowId;

    public SizeTumblingWindow(long size) {
        this.size = size;
        this.count = 0;
    }

    public long getSize() {
        return size;
    }

    public static <T> SizeTumblingWindow<T> of(long size) {
        return new SizeTumblingWindow(size);
    }

    @Override
    public long windowId() {
        return this.windowId;
    }

    @Override
    public void initWindow(long windowId) {
        this.windowId = windowId;
        this.count = 0;
    }

    @Override
    public long assignWindow(T value) {
        if (count++ < size) {
            return windowId;
        } else {
            return windowId + 1;
        }
    }

    @Override
    public WindowType getType() {
        return WindowType.SIZE_TUMBLING_WINDOW;
    }
}
